Fig. 1

Preoperative findings. a Enhanced computed tomography showed a cystic retroperitoneal tumor with a maximum diameter of 88 mm within the right adrenal gland. It had a walled nodule; a contrast effect was observed in the early phase along the cyst wall, including the nodule. b ¹²³I-meta-iodobenzylguanidine scintigraphy and c positron emission tomography with 2-deoxy-2-[fluorine-18] fluoro-D-glucose/computed tomography examination, showing the abnormal accumulation of the markers along the cyst wall (red arrow). d Magnetic resonance angiography showing an 8-mm-diameter cerebral aneurysm at the origin of the left anterior cerebral artery (yellow arrow)